Data from: Warming accelerates development but alters synchrony in a season-dependent manner in a damselfly

This dataset contains larval development data from a laboratory experiment
on the univoltine damselfly Lestes sponsa, designed to assess how
temperature and photoperiod influence development time and synchrony. The
data include individual- and family-level measurements of development
time, treatment group assignments, and survival status. Larvae were reared
under four seasonally fluctuating treatments combining early- or
late-season photoperiods with ambient or elevated temperatures, simulating
spring and summer environmental conditions. Development time is provided
for all surviving individuals until the penultimate larval instar (F–1).
The dataset supports analyses of thermal plasticity, photoperiodic
responses, and developmental synchrony across ecological contexts. All
data were collected under controlled laboratory conditions with no ethical
restrictions, and the dataset can be reused for meta-analyses or
comparative studies of insect life-history strategies, plasticity, or
climate change responses.